Difference between revisions of "ACPI hotkeys"

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{{i18n|ACPI hotkeys}}
#REDIRECT [[acpid]]
[[Category:Input devices]]
There are many guides on how to configure multimedia hotkeys using program such as xev or keyTouch.  However, this guide explains how to use the simple utility of acpi_listen and generate your own script for hotkeys.
====Who Should be Using This Guide====
This guide assumes that you know your keyboard signals through acpi.  If you do not know whether or not this is the case, I suggest looking:
*[http://en.gentoo-wiki.com/wiki/Multimedia_Keys Using Multimedia Keys in Linux]
*[[Extra Keyboard Keys|Extra Keyboard Keys - keyTouch]]
====Installing Necessary Tools====
You should already have these tools installed, but just to make sure you will need
# pacman -S acpi acpid acpitool
[[ACPI modules|Refer to this guide]] on what modules you should load (i.e. through /etc/rc.conf or modprobe)
====Using acpi_listen====
Under root, or with sufficient access to the input devices, run:
# acpi_listen
If pressing a special key, such as previous or next, receives a response that looks similar to:
hkey VALZ 00000000 00000b31
then all is well and we can continue.
If nothing appears on the screen during execution of the {{Ic|acpi_listen}}, that means that the pressed keys do not generate an ACPI event. In this case you can't use ACPI for monitoring these keys. See the page [[Hotkeys]] for other ways of mapping keys.
===Configuring ACPID===
The ACPI daemon reacts to ACPI events according to the {{ic|handler.sh}} file.  This is located in {{ic|/etc/acpi/handler.sh}}
You can either directly edit this file, to react to the ACPI events, or you can point it to another shell script (i.e.  {{ic|/etc/acpi/hotkeys.sh}})
Under the section
case "$1" in
Add the following lines:
case "$4" in
echo "PreviousButton pressed!"
exailectl p
echo "NextButton pressed!"
exailectl n
echo "Play/PauseButton pressed!"
exailectl pp
echo "executed.."
echo "StopButton pressed!"
exailectl s
echo "Hotkey Else: $4"
The '00000b31' etc. values are the response received from acpi_listen.
In 'hkey VALZ 00000000 00000b31', $4 is the final part, which was what distinguished my keys apart.
Also, the exailectl script is a brief shell script I created for controlling Exaile music player.  As the ACPID is run from root, you will need to use
sudo -u (username) exaile
for example, otherwise it will not detect your user-level program and recreate another.
====Old: Sample Script====
As keyTouch and other keyboard programs did not work for me, or did not work effectively, prior to editing my handler.sh file I created my own script that runs in the background and reacts directly from the output of acpi_listen.  However it is a poor method to use, caused my laptop to be constantly active and noisy.  I have provided the script here anyway, feel free to use it / modify it to suit your needs and post suggestions on how it can be improved.  Currently, it is setup for a Toshiba Satellite A50 laptop to control exaile, but can be modified very easily for Amarok, Xine or other non-music related functions (internet, email).
i=`acpi_listen -c 1`
case "$i" in
"hkey VALZ 00000000 00000b31")
#echo "PREVIOUS"
exaile -p
"hkey VALZ 00000000 00000b32")
#echo "NEXT"
exaile -n
"hkey VALZ 00000000 00000b33")
exaile -t
"hkey VALZ 00000000 00000b30")
#echo "STOP"
exaile -s
#echo "ELSE: $i"
if [ "$e" != "1" ]
./myHotkey.sh &
{{Note|This does not need to be run as root if you can receive an acpi_listen response from a user account (again, meaning you have access to the input devices).}}

Latest revision as of 02:09, 16 April 2013

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